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A pair of ovaries derived from oskar embryos that had received ovarian tumor cells from bam–;ovo–lacZ+ flies. One ovary has no germ cells (the residual β-galactosidase activity is due to native Drosophila activity), whereas the other has many ovarioles filled with LacZ+ tumor cells, indicating that the transplanted cells had populated the embryonic gonad and formed stem cells in several ovarioles.
